TWI796223B - Bicycle rear cassette and sprocket thereof - Google Patents

Abstract

A bicycle rear cassette is configured to be mounted on a bicycle hub. The bicycle rear cassette includes a first sprocket assembly, at least one first fastener, a second sprocket assembly, and at least one second fastener. The first sprocket assembly includes a plurality of sprockets, the sprockets of the first sprocket assembly are sequentially arranged according to outer diameters thereof. The first fastener fixes the sprockets of the first sprocket assembly. The second sprocket assembly includes a plurality of sprockets, the sprockets of the second sprocket assembly are sequentially arranged according to outer diameters thereof. One of the sprockets of the second sprocket assembly having the largest outer diameter is located adjacent to one of the sprockets of the first sprocket assembly having the smallest outer diameter. The second fastener is disposed through all of the sprockets of the second sprocket assembly and fixed to the one of the sprockets of the first sprocket assembly having the smallest outer diameter, and the second fastener is not disposed through the other sprockets of the first sprocket assembly.

Description

Bicycle rear flywheel and its sprocket

The invention relates to a rear flywheel and its sprocket, in particular to a bicycle rear flywheel and its sprocket.

Among the multiple sprockets in the rear flywheel of the current bicycle, the outer diameters of these sprockets are arranged in order from small to large, and some sprockets are fixed by the collocation of studs and rivets. For example, the stud goes through most of the sprockets and locks to the sprocket with the largest outer diameter. In order to allow some sprockets with relatively large outer diameters to withstand the force exerted by the chain with a larger deflection angle, these sprockets with relatively large outer diameters are additionally fixed by rivets, so that they have better performance. structural strength.

However, there must be tolerances in the manufacture of these sprockets, so that after these sprockets are fixed by screws, the holes through which the rivets pass through these sprockets with relatively large outer diameters cannot be accurately aligned. In order to avoid such a situation, bicycle manufacturers will slightly increase the holes for the rivets to pass through when manufacturing these sprockets with relatively large outer diameters, so that the rivets can be assembled, but this also sacrifices the outer diameter. The overall structural strength of these sprockets with relatively large diameters. Therefore, bicycle manufacturers are working on solving the aforementioned problems at present.

The present invention provides a bicycle rear flywheel and its sprocket, which can avoid the problem of sacrificing structural strength in order to properly fix the sprocket.

An embodiment of the present invention discloses a bicycle rear flywheel, which is used to be installed on a bicycle hub. The bicycle rear freewheel includes a first sprocket set, at least one first fastener, a second sprocket set and at least one second fastener. The first sprocket set includes a plurality of sprockets, and the sprockets of the first sprocket set are arranged sequentially from large outer diameters to small ones. A first fastener secures the sprockets of the first sprocket set. The second sprocket set includes a plurality of sprockets, and the sprockets of the second sprocket set are arranged sequentially from large outer diameters to small ones. The largest outer diameter of the sprockets of the second sprocket set is adjacent to the smallest outer diameter of the first sprocket set. The second fastener passes through the sprockets of the second sprocket set and is fixed to the smallest outer diameter of the sprockets of the first sprocket set without passing through the other of the sprockets of the first sprocket set By.

Another embodiment of the present invention discloses a bicycle rear flywheel, which is used for mounting on a bicycle hub. The bicycle rear freewheel includes a plurality of sprockets, at least one first fastener and at least one second fastener. These sprockets are arranged sequentially from large to small outer diameters, these sprockets are fixed by the first fastener and the second fastener, and only one of the sprockets is connected to the first fastener and the second fastener at the same time.

Yet another embodiment of the present invention discloses a sprocket of a bicycle rear sprocket, which is used to be installed on a bicycle hub. The sprocket of the bicycle rear sprocket includes an inner ring, at least one connecting arm and a gear ring. The inner ring has at least one assembly hole. One end of the connecting arm is connected to the inner ring, and the connecting arm has an assembly hole. The gear ring is connected to the other end of the connecting arm. Wherein, at least one of the assembly hole of the inner ring and the assembly hole of the connecting arm has An internal thread structure.

According to the bicycle rear flywheel and its sprockets disclosed in the above embodiments, the sprockets of the second sprocket set pass through the sprockets of the second sprocket set and are fixed to the one with the smallest outer diameter among the sprockets of the first sprocket set. , without passing through the other of these sprockets of the first sprocket set, or only one of all the sprockets is connected to the first fastener and the second fastener at the same time, which can make several pieces of chain with relatively large outer diameter The alignment of the holes for the first fastener to pass through will not be affected by the second fastener, but can be designed to match the size of the first fastener as much as possible, so it can ensure that the outer diameter is relatively large. The sprockets as a whole have the desired structural strength.

The above description of the content of the present invention and the following description of the implementation are used to demonstrate and explain the principle of the present invention, and provide further explanation of the patent application scope of the present invention.

1,1a: Bicycle rear flywheel

2: Locking element

3: Flange

10,10a: The first sprocket set

11,11a: 1st sprocket

111: inner ring

1111:Wheel assembly department

1112: engaging bump

112: connecting arm

1121, 1121a: assembly holes

1122a: Internal thread structure

113: gear ring

1131: teeth

12,12a: Second sprocket

121: inner ring

1211:Wheel assembly department

1212: engaging bump

122: connecting arm

1221, 1221a: assembly holes

123: gear ring

13,13a: Third sprocket

131: inner ring

1311:Wheel assembly department

1312: Snap bump

1313: The second assembly hole

1314: internal thread structure

132: connecting arm

1321, 1321a: first assembly hole

133: gear ring

14,14a: Gasket

142, 142a: perforation

20,20a: first fastener

21a: External thread structure

30,30a: Second sprocket set

31,31a: Fourth sprocket

311: inner ring

3111: Wheel assembly department

3112: assembly hole

3113: Snap bump

312: connecting arm

313: gear ring

32,32a: fifth sprocket

321: inner ring

3211: Wheel assembly department

3212: assembly hole

3213: Snap bump

322: connecting arm

323: gear ring

33,33a: Sixth sprocket

331: inner ring

3311: Wheel assembly department

3312: assembly hole

3313: Snap bump

332: connecting arm

333: gear ring

34,34a: Gasket

341:Wheel assembly department

3411: snap bump

342: perforation

40,40a: Second fastener

41: External thread structure

50,50a: The third sprocket set

51,51a: seventh sprocket

511:Wheel hub assembly department

5111: Snap bump

52,52a: eighth sprocket

521: sprocket part

522: abutting part

5221: Wheel hub assembly department

5222: Snap bump

53,53a: ninth sprocket

531: sprocket part

5311: abutment surface

5312: resistance application structure

532: abutting part

5321: Wheel assembly department

5322: Snap bump

54,54a: Gasket

541:Wheel assembly department

5411: Snap bump

FIG. 1 is a three-dimensional schematic diagram of a bicycle rear flywheel disclosed according to a first embodiment of the present invention.

FIG. 2 is an exploded schematic diagram of FIG. 1 .

FIG. 3 is an exploded schematic view of the first sprocket set in FIG. 2 .

FIG. 4 is an exploded schematic diagram of the second sprocket set and the sprocket with the smallest outer diameter of the first sprocket set in FIG. 2 .

FIG. 5 is an exploded schematic view of the third sprocket set and the locking element in FIG. 2 .

FIG. 6 is a schematic cross-sectional view of FIG. 1 .

Figure 7 is a vertical view of the bicycle rear flywheel disclosed according to the second embodiment of the present invention. body diagram.

FIG. 8 is an exploded schematic view of FIG. 7 .

FIG. 9 is an exploded schematic diagram of the first sprocket set in FIG. 8 .

FIG. 10 is an exploded schematic view of the second sprocket set and the sprocket with the smallest outer diameter of the first sprocket set in FIG. 8 .

FIG. 11 is an exploded schematic diagram of the third sprocket set in FIG. 8 .

FIG. 12 is a schematic cross-sectional view of FIG. 7 .

Please refer to Figure 1 and Figure 2. FIG. 1 is a three-dimensional schematic diagram of a bicycle rear flywheel disclosed according to a first embodiment of the present invention. FIG. 2 is an exploded schematic diagram of FIG. 1 .

In this embodiment, the bicycle rear flywheel 1 is used to be installed on a bicycle hub (not shown). The bicycle rear freewheel 1 includes a first sprocket set 10 , a plurality of first fasteners 20 , a second sprocket set 30 and a plurality of second fasteners 40 . In addition, the bicycle rear flywheel 1 can also include a third sprocket set 50 .

Next, please refer to FIG. 2 , FIG. 3 and FIG. 6 . FIG. 3 is an exploded schematic view of the first sprocket set in FIG. 2 . FIG. 6 is a schematic cross-sectional view of FIG. 1 .

The first sprocket set 10 includes a first sprocket 11 , a second sprocket 12 and a third sprocket 13 . Additionally, the first sprocket set 10 may also include a plurality of spacers 14 . In the first sprocket set 10, the outer diameter of the first sprocket 11 is the largest, the outer diameter of the second sprocket 12 is next, and the outer diameter of the third sprocket 13 is the smallest, wherein the outer diameter of the first sprocket 11 is In all the sprockets of the first sprocket set 10, the second sprocket set 30 and the third sprocket set 50 biggest. The first sprocket 11, the second sprocket 12, and the third sprocket 13 are arranged sequentially from large to small outer diameters, wherein a spacer 14 is located between the first sprocket 11 and the second sprocket 12, and the other A spacer 14 is located between the second sprocket 12 and the third sprocket 13 .

Next, the structures of the first sprocket 11 , the second sprocket 12 , the third sprocket 13 and the washer 14 will be further introduced.

The first sprocket 11 includes an inner ring 111 , a plurality of connecting arms 112 and a gear ring 113 . The inner ring 111 is connected to the gear ring 113 through the connecting arms 112 . The inner ring 111 has a hub assembly portion 1111, and the hub assembly portion 1111 has a plurality of engaging protrusions 1112, and these engaging protrusions 1112 are used to engage in engaging grooves (not shown) of the bicycle hub, so that The first sprocket 11 cannot rotate relative to the bicycle hub. Each of the connecting arms 112 has an assembly hole 1121 through which the first fasteners 20 pass. The gear ring 113 has a plurality of tooth parts 1131 , and the number of the tooth parts 1131 is greater than or equal to 40. In this embodiment, the number of tooth parts 1131 is 46, but it is not limited thereto. In other embodiments, the number of teeth of the gear ring of the first sprocket can be other numbers.

The second sprocket 12 also includes an inner ring 121 , a plurality of connecting arms 122 and a gear ring 123 . The inner ring 121 is connected to the ring gear 123 through the connecting arms 122 . The inner ring 121 has a hub assembly portion 1211, and the hub assembly portion 1211 has a plurality of engaging protrusions 1212, and these engaging protrusions 1212 are used to engage in engaging grooves (not shown) of the bicycle hub, so that The second sprocket 12 cannot rotate relative to the bicycle hub. Each of the connecting arms 122 has an assembling hole 1221 for passing the first fastener 20 respectively.

The third sprocket 13 also includes an inner ring 131 , a plurality of connecting arms 132 and a gear ring 133 . The inner ring 131 is connected to the ring gear 133 through the connecting arms 132 . The inner ring 131 has a hub assembly portion 1311, and the hub assembly portion 1311 has a plurality of engaging protrusions 1312, and these engaging protrusions 1312 are used to engage in engaging grooves (not shown) of the bicycle hub, so that The third sprocket 13 cannot rotate relative to the bicycle hub. Each of the connecting arms 132 has a first assembly hole 1321 , and the first assembly holes 1321 have no internal thread structure, and the first assembly holes 1321 are respectively used for passing the first fasteners 20 .

Each of the pads 14 has a plurality of through holes 142 through which the first fasteners 20 pass.

These first fasteners 20 are, for example, rivets and have no external thread structure matched with the internal thread structure. The first fasteners 20 are respectively passed through the first assembly holes 1321 of the third sprocket 13, the assembly holes 1221 of the second sprocket 12, the assembly holes 1121 of the first sprocket 11 and the gaskets 14. The through holes 142 fix the first sprocket 11 , the second sprocket 12 , the third sprocket 13 and the spacers 14 together.

It should be noted that the number of connecting arms of the first sprocket 11 , the second sprocket 12 and the third sprocket 13 is not limited to a plurality. In other embodiments, the number of connecting arms of the first sprocket, the second sprocket and the third sprocket can be only one, and the number of the first fastening member can also be only one.

Next, please refer to Figures 2, 4 and 6. FIG. 4 is an exploded schematic diagram of the second sprocket set and the sprocket with the smallest outer diameter of the first sprocket set in FIG. 2 .

The second sprocket set 30 includes a fourth sprocket 31, a fifth sprocket 32 And a sixth sprocket 33. Additionally, the second sprocket set 30 may also include a plurality of spacers 34 . In the second sprocket set 30, the outer diameter of the fourth sprocket 31 is the largest, the outer diameter of the fifth sprocket 32 is next, and the outer diameter of the sixth sprocket 33 is the smallest, wherein the outer diameter of the fourth sprocket 31 Smaller than the outer diameter of the third sprocket 13 of the first sprocket set 10 , and the sixth sprocket 33 is larger than the outer diameters of all the sprockets of the third sprocket set 50 . The fourth sprocket 31, the fifth sprocket 32 and the sixth sprocket 33 are arranged in descending order from the outer diameter, and the fourth sprocket 31 is adjacent to the third sprocket 10 of the first sprocket set 10 through one of the spacers 34. For the sprocket 13 , another spacer 34 is located between the fourth sprocket 31 and the fifth sprocket 32 , and another spacer 34 is located between the fifth sprocket 32 and the sixth sprocket 33 .

Next, the structures of the fourth sprocket 31 , the fifth sprocket 32 , the sixth sprocket 33 and these spacers 34 will be further introduced.

The fourth sprocket 31 includes an inner ring 311 , a plurality of connecting arms 312 and a gear ring 313 . The inner ring 311 is connected to the ring gear 313 through the connecting arms 312 . The inner ring 311 has a hub assembly portion 3111 and a plurality of assembly holes 3112 , and the hub assembly portion 3111 has a plurality of engaging protrusions 3113 . These engaging projections 3113 are used to engage in engaging grooves (not shown) of the bicycle hub, so that the fourth sprocket 31 cannot rotate relative to the bicycle hub. The assembly holes 3112 are respectively used for the second fasteners 40 to pass through.

The fifth sprocket 32 also includes an inner ring 321 , a plurality of connecting arms 322 and a gear ring 323 . The inner ring 321 is connected to the gear ring 323 through the connecting arms 322 . The inner ring 321 has a hub assembly portion 3211 and a plurality of assembly holes 3212 , and the hub assembly portion 3211 has a plurality of engaging protrusions 3213 . These engaging projections 3213 are used to engage in the engaging grooves (not shown) of the bicycle hub, so that the fifth sprocket 32 cannot be relatively self-propelled. The hub turns. The assembly holes 3212 are respectively used for the second fasteners 40 to pass through.

The sixth sprocket 33 also includes an inner ring 331 , a plurality of connecting arms 332 and a gear ring 333 . The inner ring 331 is connected to the gear ring 333 through the connecting arms 332 . The inner ring 331 has a hub assembly part 3311 and a plurality of assembly holes 3312, and the hub assembly part 3311 has a plurality of engaging protrusions 3313, and these engaging protrusions 3313 are used to engage in engaging grooves (not shown) of the bicycle hub. shown), so that the sixth sprocket 33 cannot rotate relative to the bicycle hub. The assembling holes 3312 are respectively used for passing the second fasteners 40 .

Each of the spacers 34 has a hub assembly portion 341 and a plurality of through holes 342 . The hub assembly part 341 has a plurality of engaging protrusions 3411 for engaging with engaging grooves (not shown) of the bicycle hub so that the washer 34 cannot rotate relative to the bicycle hub. The through holes 342 are respectively used for passing the second fasteners 40 .

In this embodiment, the inner ring 131 of the third sprocket 13 of the first sprocket set 10 also has a plurality of second assembly holes 1313 . The second assembly hole 1313 is closer to the hub assembly portion 1311 of the inner ring 131 of the third sprocket 13 than the first assembly hole 1321 in the radial direction of the third sprocket 13 . Each of the second assembly holes 1313 has an internal thread structure 1314 . The second fasteners 40 are, for example, studs and each has an external thread structure 41 . The second fasteners 40 are respectively passed through the assembly holes 3312 of the sixth sprocket 33 , the assembly holes 3212 of the fifth sprocket 32 , the assembly holes 3112 of the fourth sprocket 31 , and a plurality of the spacers 34 . perforation 342, and locked to these second assembly holes 1313 of the third sprocket 13 of the first sprocket set 10, and the third sprocket 13, the fourth sprocket 31, the fifth sprocket 32, the sixth chain The wheel 33 and these spacers 34 are fixed together.

It should be noted that the fourth sprocket 31, the fifth sprocket 32 and the sixth sprocket The number of connecting arms 33 is not limited to a plurality. In other embodiments, the number of connecting arms of the fourth sprocket, the fifth sprocket and the sixth sprocket may be only one.

In addition, the assembly hole 3312 of the sixth sprocket 33 , the assembly hole 3212 of the fifth sprocket 32 , the assembly hole 3112 of the fourth sprocket 31 , the through hole 342 of each spacer 34 and the third chain of the first sprocket set 10 The number of the second assembly holes 1313 of the wheel 13 is not limited to a plurality. In other embodiments, the assembly hole of the sixth sprocket, the assembly hole of the fifth sprocket, the assembly hole of the fourth sprocket, the perforation of each spacer and the second assembly of the third sprocket of the first sprocket set The number of holes may be only one, and the number of second fasteners may be only one.

Next, please refer to Figures 2, 5 and 6. FIG. 5 is an exploded schematic view of the third sprocket set and the locking element in FIG. 2 . The third sprocket set 50 includes a seventh sprocket 51 , an eighth sprocket 52 , a ninth sprocket 53 and a spacer 54 .

In the third sprocket set 50, the outer diameter of the seventh sprocket 51 is the largest, the outer diameter of the eighth sprocket 52 is second, and the outer diameter of the ninth sprocket 53 is the smallest, wherein the outer diameter of the seventh sprocket 51 is Less than the outer diameter of the sixth sprocket 33 of the second sprocket set 30, and the outer diameter of the ninth sprocket 53 is all the chains of the first sprocket set 10, the second sprocket set 30 and the third sprocket set 50 The smallest of the wheels. The seventh sprocket 51, the eighth sprocket 52, and the ninth sprocket 53 are arranged in descending order from the outer diameter, and the seventh sprocket 51 is adjacent to the sixth sprocket of the second sprocket set 30 through the spacer 54. 33.

Next, the structures of the seventh sprocket 51 , the eighth sprocket 52 , the ninth sprocket 53 and the washer 54 will be further introduced.

The seventh sprocket 51 has a hub assembly part 511, and the hub assembly part 511 has a plurality of engaging protrusions 5111, and these engaging protrusions 5111 are used to engage in engaging grooves (not shown) of the bicycle hub, so that the seventh sprocket 51 cannot rotate relative to the bicycle hub.

The eighth sprocket 52 includes a sprocket portion 521 and a contact portion 522 . The abutting portion 522 protrudes from the sprocket portion 521 along the axial direction of the sprocket portion 521 . The abutting portion 522 of the eighth sprocket 52 abuts against the seventh sprocket 51 , and the sprocket portion 521 of the eighth sprocket 52 maintains a distance from the seventh sprocket 51 . The abutting portion 522 of the eighth sprocket 52 has a hub assembly portion 5221, and the hub assembly portion 5221 has a plurality of engaging protrusions 5222, and these engaging protrusions 5222 are used to engage in engaging grooves ( not shown), so that the eighth sprocket 52 cannot rotate relative to the bicycle hub.

The ninth sprocket 53 includes a sprocket portion 531 and a contact portion 532 . The abutting portion 532 protrudes from the sprocket portion 531 along the axial direction of the sprocket portion 531 . The abutting portion 532 of the ninth sprocket 53 abuts against the sprocket portion 521 of the eighth sprocket 52 , and the sprocket portion 531 of the ninth sprocket 53 is kept at a distance from the sprocket portion 521 of the eighth sprocket 52 . The abutting portion 532 of the ninth sprocket 53 has a hub assembly portion 5321, and the hub assembly portion 5321 has a plurality of engaging protrusions 5322, and these engaging protrusions 5322 are used to engage in engaging grooves ( not shown), so that the ninth sprocket 53 cannot rotate relative to the bicycle hub.

The spacer 54 has a hub assembly portion 541 . The hub assembly part 541 has a plurality of engaging protrusions 5411, and these engaging protrusions 5411 are used to engage with engaging grooves (not shown) of the bicycle hub, so that the washer 54 cannot rotate relative to the bicycle hub.

In this embodiment, the integral bicycle rear flywheel 1 is used to transmit and A locking element 2 combined with the wheel hub is positioned on the wheel hub of the bicycle. The locking element 2 has a flange portion 3 , and the sprocket portion 531 of the ninth sprocket 53 has an abutting surface 5311 and a resistance applying structure 5312 . The abutting surface 5311 of the sprocket portion 531 of the ninth sprocket 53 faces away from the eighth sprocket 52 . The resistance applying structure 5312 is, for example, a concave-convex structure, which is located on the abutting surface 5311 of the sprocket portion 531 of the ninth sprocket 53 . The flange portion 3 of the locking element 2 abuts against the resistance applying structure 5312 of the sprocket portion 531 of the ninth sprocket 53 to prevent the locking element 2 from being loosened by rotating relative to the bicycle hub.

In this embodiment, the first sprocket 11, the second sprocket 12, the third sprocket 13, the fourth sprocket 31, the fifth sprocket 32, the sixth sprocket 33, the seventh sprocket 51, the eighth sprocket The thickness of the sprocket portion 521 of the sprocket 52 and the sprocket portion 531 of the ninth sprocket 53 is at least 1.8 mm, but not limited thereto, and the thickness of the aforementioned sprockets can be adjusted according to requirements.

In this embodiment, the second fastener 40 passes through all the sprockets (the fourth sprocket 31, the fifth sprocket 32 and the sixth sprocket 33) of the second sprocket set 30 and is fixed on the first sprocket set The third sprocket 13 with the smallest outer diameter in these sprockets of 10 does not pass through the others in these sprockets of the first sprocket set 10; that is to say, only the third sprocket 13 is simultaneously Connect the first fastener 20 and the second fastener 40 so that the first sprocket 11 , the second sprocket 12 and the third sprocket 13 with relatively large outer diameters are connected to each other through the assembly holes through which the first fastener 20 passes. The alignment between them will not be affected by the second fastener 40, but can be designed to match the size of the first fastener 20, so it can ensure that the first sprocket 11, the second sprocket 12 and the second sprocket 12 with a relatively large outer diameter Triple sprocket 13 as a whole has the desired knot structural strength.

In addition, among the first assembly hole 1321 and the second assembly hole 1313 of the third sprocket 13, only the second assembly hole 1313 has an internal thread structure 1314, and the configuration of the first assembly hole 1321 without an internal thread structure can make the second assembly hole 1321 have an internal thread structure. The size and position of the first assembly hole 1321 of the third sprocket 13 do not require high precision requirements, as long as the first fastener 20 can be installed, so the manufacturing difficulty of the third sprocket 13 can be reduced.

It should be noted that the first assembly hole 1321 of the third sprocket 13 is not limited to have no internal thread structure, and the second assembly hole 1313 is not limited to have the internal thread structure 1314 . In other embodiments, both the first assembly hole and the second assembly hole of the third sprocket may have internal thread structures, and the first fastener and the second fastener may be studs. In another embodiment, the first assembly hole of the third sprocket may have an internal thread structure, and the second assembly hole may not have an internal thread structure, and the first fastener may be a stud, and the second fastener may be a rivet.

Next, please refer to Figure 7 to Figure 12 . FIG. 7 is a three-dimensional schematic diagram of the bicycle rear flywheel disclosed according to the second embodiment of the present invention. FIG. 8 is an exploded schematic view of FIG. 7 . FIG. 9 is an exploded schematic diagram of the first sprocket set in FIG. 8 . FIG. 10 is an exploded schematic view of the second sprocket set and the sprocket with the smallest outer diameter of the first sprocket set in FIG. 8 . FIG. 11 is an exploded schematic diagram of the third sprocket set in FIG. 8 .

The bicycle rear flywheel 1a of the present embodiment also includes a first sprocket set 10a, a plurality of first fasteners 20a, a second sprocket set 30a, a plurality of second fasteners 40a and a third sprocket set 50a, wherein The first sprocket wheel set 10a comprises a first sprocket wheel 11a, a second sprocket wheel 12a, a third sprocket wheel 13a and a plurality of spacers 14a, the second sprocket wheel set 30a includes a fourth sprocket 31a, a fifth sprocket 32a, a sixth sprocket 33a and a plurality of spacers 34a, and the third sprocket set 50a includes a seventh sprocket 51a, an eighth sprocket 52a , a ninth sprocket 53a and a spacer 54a. These aforementioned elements are similar to the corresponding elements in the bicycle rear flywheel 1 described above with reference to FIGS. The type of a fastener is different and the structure of the assembly hole of the first sprocket for the installation of the first fastener is different, so the following mainly focuses on the difference. For other components and structures, please refer to the above-mentioned bicycle referring to Figures 1 to 5 The content of the description of the rear flywheel will not be repeated here.

In detail, each of the assembly holes 1121a of the first sprocket 11a has an internal thread structure 1122a. The first fasteners 20a are, for example, studs, and each has an external thread structure 21a. The first fasteners 20a are respectively passed through the first assembly holes 1321a of the third sprocket 13a, the assembly holes 1221a of the second sprocket 12a and the through holes 142a of the gasket 14a, and the first fasteners 20a The external thread structures 21a respectively combine with the internal thread structures 1122a of the assembly holes 1121a of the first sprocket 11a, so that the first sprocket 11a, the second sprocket 12a, the third sprocket 13a and the spacer 14a are fixed together.

In the present invention, the first sprocket set is not limited to the sprocket set with the largest outer diameter in the overall bicycle rear flywheel. In other embodiments, the first sprocket set may not be the sprocket set with the largest outer diameter in the entire bicycle rear flywheel. For example, the first sprocket set may be the sprocket set with the second largest outer diameter in the overall bicycle rear cassette.

In addition, the number of sprockets in each sprocket set is not intended to limit the present invention. It can be adjusted according to actual needs.

Furthermore, the spacers of each sprocket set are optional components. In other embodiments, the sprocket set may not have a spacer, and the protruding structure of one of the two adjacent sprockets may serve as a spacer.

According to the bicycle rear flywheel and its sprockets disclosed in the above embodiments, the sprockets of the second sprocket set pass through the sprockets of the second sprocket set and are fixed to the one with the smallest outer diameter among the sprockets of the first sprocket set. , without passing through the other of these sprockets of the first sprocket set, or only one of all the sprockets is connected to the first fastener and the second fastener at the same time, which can make several pieces of chain with relatively large outer diameter The alignment of the holes through which the first fastener passes will not be affected by the second fastener, but can be designed to accurately match the size of the first fastener, so it can ensure that the outer diameter is relatively large. The sprockets as a whole have the desired structural strength.

Although the present invention is disclosed above with the aforementioned preferred embodiments, it is not intended to limit the present invention. Any person familiar with the similar art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of patent protection for inventions shall be defined in the scope of patent application attached to this specification.

2: Locking element

3: Flange

10: The first sprocket set

11: First sprocket

12: Second sprocket

13: Third sprocket

20: First Fastener

30: Second sprocket set

31: Fourth sprocket

32: Fifth sprocket

33: Sixth sprocket

40: Second Fastener

50: The third sprocket set

51: seventh sprocket

52: Eighth sprocket

53: ninth sprocket

5311: abutment surface

5312: resistance application structure

Claims (11)

A rear flywheel of a bicycle, used to be installed on a bicycle hub, comprising: a first sprocket set including a plurality of sprockets, the sprockets of the first sprocket set are arranged sequentially from large outer diameter to small ; at least one first fastener, fixing the sprockets of the first sprocket set; a second sprocket set comprising a plurality of sprockets, and the sprockets of the second sprocket set have an outer diameter as large as are arranged sequentially, and the one with the largest outer diameter of the sprockets of the second sprocket set is adjacent to the smallest outer diameter of the sprockets of the first sprocket set; and at least one second tight Firmware passing through the sprockets of the second sprocket set and fixed to the one with the smallest outer diameter among the sprockets of the first sprocket set without passing through the chains of the first sprocket set others in the wheel. The bicycle rear freewheel as described in claim 1, wherein the one with the smallest outer diameter among the sprockets of the first sprocket set has at least one first assembly hole and at least one second assembly hole, and the at least one first assembly At least one of the hole and the at least one second assembly hole has an internal thread structure, at least one of the at least one first fastener and the at least one second fastener has an external thread structure matched with the internal thread structure, the At least one first fastener is assembled in the at least one first assembly hole, and the at least one second fastener is assembled in the at least one second assembly hole. The bicycle rear flywheel according to claim 2, wherein the at least one second assembly hole has the internal thread structure, and the at least one second fastener has the external thread structure, and the external thread structure of the at least one second fastener is combined with the internal thread structure of the at least one second assembly hole. The bicycle rear flywheel according to claim 3, wherein the at least one first fastener is a rivet, the at least one first assembly hole and the at least one first fastener have no matching internal thread structure and external thread structure respectively, and the at least one A first fastener is passed through the at least one first assembly hole of one of the sprockets with the smallest outer diameter in the first sprocket set and the other sprockets in the first sprocket set. The bicycle rear flywheel according to claim 3, wherein the at least one first fastener is a stud, and the at least one first assembly hole and the at least one first fastener have no matching internal thread structure and external thread structure respectively, The at least one first fastener is passed through the at least one first assembly hole of one of the sprockets of the first sprocket set with the smallest outer diameter, and is fixed to the first sprocket set by screw locking. The one with the largest outer diameter among the sprockets. The bicycle rear freewheel as described in claim 2, wherein the one with the smallest outer diameter among the sprockets of the first sprocket set further has a hub assembly part, and the hub assembly part is used to assemble on the bicycle hub, the at least A first assembling hole is farther away from the hub assembling part than the at least one second assembling hole in the radial direction of one of the sprockets of the first sprocket set with the smallest outer diameter. The bicycle rear sprocket according to claim 1, wherein the number of teeth of the sprocket with the largest outer diameter among the sprockets of the first sprocket set is greater than or equal to 40. The rear sprocket of claim 1, wherein the thickness of the sprockets of the first sprocket set and the sprockets of the second sprocket set are at least 1.8mm. The bicycle rear freewheel according to claim 1, wherein the sprockets of the first sprocket set and the sprockets of the second sprocket set each have a hub assembly portion for assembling with the bicycle hub. A sprocket of a rear flywheel of a bicycle, used to be installed on a bicycle hub, comprising: an inner ring having a hub assembly portion and at least one assembly hole; at least one connecting arm, one end of the at least one connecting arm is connected to the inner ring ring, the at least one connecting arm has an assembly hole; and a toothed ring, connected to the other end of the at least one connecting arm; wherein, the at least one assembly hole of the inner ring and the assembly hole of the at least one connecting arm are at least One has an internal thread structure. A bicycle rear flywheel, used to be installed on a bicycle hub, the bicycle rear flywheel comprises a plurality of sprockets, at least one first fastener and at least one second fastener, and the sprockets are arranged in order from large to small outer diameters arranged, the sprockets are fixed by the at least one first fastener and the at least one second fastener, and only one of the sprockets is simultaneously connected to the at least one first fastener and the at least one second Fasteners; wherein, the assembly direction of the at least one first fastener is opposite to the assembly direction of the at least one second fastener.

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